Manufacture of incandescent bodies of metallic tungsten or molybdenum for electric incandescent lamps.



UNITED strAr 'zs PATENT Aaron ram-mes, or er'te'ttitsnthr, than mam, Austen-fitment. Manhattan a mdxaenscam norms as MEIALnIC rmaesrnx on Mommas No Drawing.

' subject of Austria, reslding at No. 83Atzgersdorf, near Vienna, in the Province of Lower Austria, Austria-Hungary, have invented new and useful Improvements in the Manufacture of Incandescent Bodies of Me-.

- tallicTungsten or Molybdenum for Electric mass may be roduced by Incandescent Lamps, of which the following is a specification.

My invention relates to an improved process of manufacture of incandescent bodies of metallic tungsten or molybdenum for electric incandescent lamps,'-this process differing from other similar processes already known by the fact that there is added to the sulfids or oxids of the said metals, and if desired to the metals themselves, used as the startinglmaterialsof manufacture amorphous sul r and the mixture intimately kneaded to a pasty mass. Then from this ressure filaments, bars or simi ar bodies, the conversion of which into bodies of pure metal is carried throu h by means of any ofthe processes alrea y known for that purpose.

Amor hous sulfur, ing a soft, plastic mass,when used as binding material in the process of making metallic filaments or bars of tungsten or of molybdenum offers considerable advantages over organic binding materials, viz: It secures a reliable and unhindered carrying through of the process The use of'other kinds of sulfur as for.exarnple of rhombic or of monoclinic or other sulfur does not suit for the purpose ofth'e present invention because the use of such .a kind of sulfur would absolutely necessitate an intense heating of the cylinder of the 'press in order to allow the production by pressure of the bodies in the desired form. The powdered f sulfur if so heated would not only react upon the tungsten and molybdenum, but it would attack the metal of the cylinder of the res too, whereby not only the mixture unar pressure would be injured but in consequence of the secondary reaction of the sulfur the plunger of the press would strongly adhere to the wall of the cyhnder 5 and interfere with the continuation of the pressing process. c

In order to practically carry out the mvention I proceed as follows: I intimately mix either the sulfids-of tungsten or of h steamer of Letters Patent. Application flle'd August 2t, 1966. serial no; $32,076.

as already known, be-

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molybdenum alone or with some. of the metals or of some oxid of the metals added thereto (eventually at a' slightly elevated OFFICE. I

temperature) with amorphous sulfur and make of this mixture aste by kneading' this pas'te is then w ork d into filaments of other body by forcing it through a-die or by pressing it in-any other way. Filaments or bars or other bodies thus obtained soon stifi'en when exposed to air. They are then heated in a reducing gas as for example in hydrogen; the sulfur contained in the bodies combines with the hydrogen to sulfereted hydrogen and the body is converted into a 'metallic body. These bodies are finally highly heated under exclusion of air by means of the electric current passed through same whereby the bodies sinter and become coherent. p

In the same manner as above described I may work metallic tungsten or metallic molybdenum or mixtures of both metals with amorphous sulfur. In this case it will not be necessary sometimes to heat the filaments, bars'or similar bodies (obtainedby pressure) in a reducing as, as the filaments or bars are already con uctive and the sulfur ,vaporizes, when the filaments or bars are heated (under exclusion of air) by the electric current, passed throu h. I

It is evident that instea of the pure metals or of the sulfids of same, also their oxids'may be used and treated in the samewe. p Y

ll lhatIcla-im as my invention, and desire .to secure by Letters Patent is 1. The process of manufacturing metallic filaments for incandescent electric lamps, consisting of intimately mixing amorphous sulfur with the other constituents used in making the filaments, kneading the mixture to a pasty mass, forming filaments from this aste by }pressure, exposing the same to air, heating t e bodies when stifi in a reducing gas, and finally passing an electric current therethrough in cacao.

2. The process of manufacturin metallic filaments for incandescent electric lamps, which consists in intimately mixing amorphous sulfur with the sulfids of tungsten, kneading the mixture to a pasty mass, forming filaments from the aste, drying "the same inthe air, heatin t e same when stifi" in the presence of a re ucing gas, and passing electric current therethrough.

and passing an e ectric current therethrough in oac'uo,

The process for manufacturing. bodies of pure tungsten, which consists in intimately mixing powdered tungsten with amorphous sulfur, shaping themixture thus obtained into the desired. form by means of 15 pressure and finally heating the bodies to a igh temperature for the purpose of removin the sulfur and consolidating the said bo ies.

In testimony whereof I have signed my 20 name to this specification in the presence of two subscribing witnesses.

ANTON LEDERER.

Witnesses:

ALvEe'ro S. HOGUE, AUoUsT FUGGER. 

